Radiation Attenuation of Gypsum Wallboard
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Date
2011-02-02
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Bulletin of the Department of Medical Sciences - วารสารกรมวิทยาศาสตร์การแพทย์
Abstract
ABSTRACT Key words : x-ray, gypsum wallboard, attenuation, HVL, TVLThis research was to study radiation attenuation and to investigate the thickness of gypsumwallboard used as radiation shielding for general diagnostic x-ray and dental x-ray machines. The radiationattenuation of the gypsum wallboard was comparatively tested by using a dental x-ray machine (at 60 kVp),a general x-ray machine in single phase system (at 60, 80 and 100 kVp) and a general x-ray machine inthree phases system (at 60, 80 and 100 kVp). The parameters of attenuation including of a , b, g, HVL andTVL were obtained from fitting curve according to the Douglas J. Simpkin (1995) method. Levels of radiationattenuation at 60 kVp were high for all x-ray machines. Nevertheless, at 80 kVp and 100 kVp, low radiationattenuation was found both for a single phase and three phase general x-ray machines. Although a greaternumber of gypsum wallboard were used, the radiation attenuation was found to be constant. The resultssuggested that gypsum wallboard is not suitable for using as primary and secondary radiation shielding for generaldiagnostic x-ray machines. It is also not suitable for using as primary protective barrier of dental x-raymachines. However, It was found that gypsum wallboard can provide suitable protection for using assecondary radiation shielding of dental x-ray unit at the workload of 200 mA*min/wk for the distance of1.5 meters from the x-ray tube, if its thickness is at least 2.1 centimeters.
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Bulletin of the Department of Medical Sciences - วารสารกรมวิทยาศาสตร์การแพทย์; Vol.50 No.1 January - March 2008; 14-23